Portable drill press



March 1 A. N. ROE

PORTABLE DRILL PRESS.

Filed NOV. 6, 1957 Arm/(M X United tates PQRTABLE DRILL PRESS Albert N. Roe, Bethlehem, Pa.

Application November 6, 1957, Serial No. 694,774

8 Claims. c1. 77-7 This invention relates to portable drill supporting apparatus, and is especially concerned with a novel and highly improved portable drill press for use with hand power drills.

It is one object of the present invention to provide a portable drill press of the type mentioned which effectively serves to steady and guide an operator, while affording ample freedom of drill movement for high versatility and advantageous employment under many varied conditions of use.

It is a further object of the present invention to provide a portable drill press having the advantageous characteristics mentioned in the preceding paragraph, which is extremely simple and durable in construction, rapid, accurate and easy to use, and which can be manufactured and sold at a reasonable cost.

Other objects of the present invention will become apparent upon reading the following specification and referring to the accompanying drawings, which form a material part of this disclosure.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, which will be exemplified in the construction hereinafter described, and of which the scope will be indicated by the appended claims.

In the drawings:

Figure 1 is a longitudinal elevational view showing a portable drill press constructed in accordance with the present invention, in operative association with a hand, power drill, with parts broken away for clarity of understanding and conservation of drawing space;

Figure 2 is a partial, sectional view, taken substantially along the line 2-2 of Figure 1;

Figure 3 is a partial, sectional View, taken substantially along the line 3--3 of Figure l;

Figure 4 is a partial, sectional view, taken substantially along the line 44 of Figure 1;

Figure 5 is a sectional View taken substantially along the line 55 of Figure 1; and

Figure 6 is a sectional view taken substantially along the line 6-6 of Figure 5 and illustrating in phantom outline alternate positions of the hand power drill.

Referring now more particularly to the drawings, and specifically to Figure 1 thereof, there is illustrated therein an elongate frame, generally designated 10, which is adapted for detachable securement by any suitable means 11 to a convenient, fixed support. An arm, generally designated 12, is connected to the frame and extends therefrom, where it is adapted to carry a hand power drill, generally designated 13.

More particularly, the elongate frame 10 includes an end piece 15, from which extend a pair of relatively rigid, parallel spaced side pieces 16 terminating at their distal ends in externally threaded portions 17. Fixedly secured in threaded engagement on the distal end portion 7 of the elongate side pieces 16 is a cap or end piece 18 having a central through bore 13. The end piece ay be provided with a longitudinally outwardly project- 2,827,866 Patented Mar. 25, 1958 ing threaded stud 20 for removable engagement in the attachment means 11. It is understood that the attachment means 11 may assume any desired construction, such as that of a C-clamp, or it may take the form of an electromagnet, or other, as desired.

An elongate lead screw 22 is arranged longitudinally within the frame 10, being located in spaced parallelism with and between the frame side pieces 16, and has one end portion 23 received in a longitudinally inwardly opening socket 24 of the end piece 15. The screw end portion 23 is rotatably retained in the end piece socket by any suitable means, such as a retainer key or collar 25. The other end portion 26 of the lead screw 22 extends rotatably through and beyond the central bore 19 of end piece 18, where it is provided with suitable hand actuable means 27 for effecting axial rotation of the lead screw. That is, the hand actuable means 27 for rotating the lead screw 22 may be located longitudinally outward of the frame end piece 18 and assume the form of a hand wheel, if desired.

Circumposed about the threaded portion of lead screw 22, intermediate the lead screw end portions 23 and 26, and in threaded engagement with the lead screw is an internally threaded collar or follower nut 30, see Figures 2 and 3. Thus, if the follower nut 39 is held against rotation with the lead screw 22, upon rotation of the latter the follower nut will move longitudinally of the lead screw and frame 10. Projecting from diametrically opposed regions of the follower nut 30 intermediate the frame side pieces 16 are a pair of aligned pivot pins, pintles or gudgeons 31 extending laterally outward on opposite sides of the frame. The pintles 31 may be of generally cylindrical configuration, if desired, and it will now be understood that the pintles are mounted in the frame 10 for movement in either direction longitudinally of the frame by means of the lead screw 22 and follower nut 30.

The arm 12 may be formed of a pair of parallel, elongate channel members 34 or bars formed on their facing sides with longitudinally extending recesses or channellike troughs 35, and having their distal pair of adjacent ends rigidly connected together, as at 36. The other pair of adjacent ends of the channel members 34 are preferably connected together by a suitable, openable closure, such as the latch 37 pivoted at 38 to one of the channel members and swingable into and out of interengagement with the other channel member.

As best seen in Figure 2, the channel members 34 of the arm 12 are respectively disposed on opposite sides of the frame 10, or on opposite sides of the frame member 16, and each channel member receives in its recess or trough 35 a respective one of the aligned pintles 31. That is, the pintles 31 each project from the follower nut 30 into the longitudinal recess of a respective channel member 34 where it is slidably received. Hence, each of the pintles 31 is slidable and rotatable relative to its receiving channel member 34, to thereby mount the channel members, or arm 12, for free swinging movement about the axis of the aligned pintles, and also for free shifting movement longitudinally of the arm in a plane containing the pintle axis.

Adjacent to and spaced inward from 'the arm end 36 is provided a drill holder, generally designated 40, by means of which the drill 13 is connected to the arm. As best seen in Figures 4-6, the drill holder 40 is located in the space between the channel members 34 and includes a pair of clamping elements or blocks 41 disposed in facing relation and recessed on their facing sides, as at 42, to conformably receive a longitudinally intermediate portion of the drill l3. Suitable fasteners 43 may be extended through the clamping elements 41 to hold the latter firmly against the received drill portion 44, so that the drill 13 and drill holder 40 combine to define a rigid unit. A pair of aligned pivot elements of pins 46 may be respectively threaded into the clamping elements 41 with their :outer ends rotatably receivedfin respective channel mem- -bers34z1Further, thealigned pivot-pins 46 are journaled in respective channel members 34 was to be disposed substantial parallelism with the axis of 'pintles 3-1 to V mount the drill holder 40 and its rigidly held-drill 13 forrotat'ion relative 'to the arm ll aboutan axisparallel to that'of the pintles. In order tollimit rotation of the drill holder 40 relative to' the arm 12, stop members or pins 47 may project. respectively from opposite sides of the drill holder into the channels 35 for abutting engagement with the sidewalls of the channels. a V a While operation of the subject deviceis believed to be apparent. from the foregoing description of th'e elements and their cooperating relationship, the operation. may be briefly outlined as .follows. 7 I

With the frame 10'fixed to a convenient support in the region'of 'material to be drilled,.and the proper drill bit 59 secured in the drill chuck 51, the drill '13 is arranged in substantial alignment With-the markedlocation ofthe hole and the lead screw 22 rotated by actuation of the hand wheel 27 to dispose the arm 12 substantiall-ynormal to both the frame 10 and drill'13, the condition-illustrated in Figure 1. Thehole may then be drilled-in the usual manner, the apparatus'of the present invention serving to; steady and guide. the operator, and allowing accurate axial insertion of the drill bit into the drilled'hole by reason of the relative swinging movement of-the drill holder and arm, and the relative swinging and-shifting movement of the arm and followernut 30 or frame 10. Of COllISQ'illUdl'lll may be withdrawn from thefinished hole by mere reversal of the above-described motions.

:From the foregoing, it is seen that the present invention provides a portable drill press which ful'lyacco'mplished its intended objects. and is well adapted to the practical conditions of manufacture'and use. v

Although'the present invention has. been described in a some detail by way of illustration and example for-purposes of clarity of understanding, it isunderstoodthat certain changes and modifications may be made within for manually rotating the latter,.a followerlnut in said means comprising at least one pin projecting from said nut transversely of said screw, said arm being provided with a longitudinally extending slideway rotatably and slidably receiving said pin to connect said arm for said 7 swinging and shifting movement.

3. A portable drill press according to claim 1, said drill holder comprising a pair of clamping elements adapted to releasably clamp adrilltherebetween, pivot means connecting said'clamping elements to said arm for rotation about an axis parallel to-theaxis of said swinging movement of said arm, and stop means for limiting the swinging movement of said clamping elements. 7

4. A portable drill press comprising an elongate frame having one end adapted for attachment to a fixed support, a pair of aligned oppositely extending pintles arranged in said frame projecting laterally from opposite sides thereof, means mounting said pintles for adjustable movement longitudinally of said, frame, an arm having a pair of parallel "slide ways respectively slidably androtatably receiving said pintles to mount said arm for swinging move ment about the axis ofsaid pintlesand shifting movementrelative togsaid'pintles longitudinally of said arm, and a drill holder carried by said arm for movement. therewith and limited swinging movement relativeto saidarm about an axis parallel to the axis" of swinging movement of said arm,'whereby said drillholder, and consequently a drill carried thereby, arevmovable substantially longitudr-a nally of said frameupon said swingingdrillholdermovement. and said swinging and shiftingmovement of said arm. 1 3 a Y 5. A portable dr'ill pressaccording to claim .4, wherein said parallel slide'ways are defined by .a'pairof facing nected together at theiradjacent pairs of endsandgdischannels formed in said arm. each slidablyandrotatably receiving a. respective .pintle. :end :portion.

6. A..p'or.table.-.drill press according to claim 4,,said arm comprising a'pair of parallel facing .channels.con-

posed, on .oppositesides of'saidfframe, the innersides of said channels defining-said ,slideways andgrespectively receiving the end portions of-rsaid pintles. V

7; A portable drill press-according to claim 16,- said drill holder comprising a pair of clamping elements 10-. cated bet-weensaid: channels andadapted to treleasably clamp about a drill, .pivot means connecting jsaid clamp ing elements to said channels 'forrotationof said clamping elements about an axis parallel .to,.-th e axis of. swing-.

ing movementof .said channels, andstop'elementsrcarried V bysaid clamping elements andextending into saidchanframe and in threaded engagement withlsaidlend screw for'movement along said screw upon rotation ,of the latter, transverse pivot means on saidnut'for. movement 7 drill holder and consequently. a drill carried thereby. are

movable substantially longitudinally of said frame upon said swinging. movement ofsaid .drill holdenandsaid' swinging and sliding movement of said arm.

2. v A portable drill press according to claim-.1, said pivot nels for engagement with theside walls thereof to limit swinging movement of said clamping elements. a

8. A portable drill pressqaccording to.claim 14, said pintle mounting means comprising a. lead screw arranged longitudinally of and rotatablyisupplorted =at its opposite ends inisaid fram w nd a follower. nut carrying said pintles and mounted on said lead screw in threaded engagement. therewith for "movement longitudinally. along said leadscrewnponrotafion of. the. latter.'

- References Qited in'the file 'ofthis patent uniran STATESPATENTS 

